Depletion of Adrenaline Stores of Adrenal Gland and Increased Release of Catecholamines in Blood during the Final Stage of Pregnancy and post partumin Rabbits

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Abstract
Plasma adrenaline and noradrenaline in rabbits on the 30th day of pregnancy show significant increases. On the 31st day of pregnancy a sharp decline in plasma noradrenaline was observed, but adrenaline was higher than the controls. Adrenaline in plasma returned to control level at parturition, and no change occurred 4 h after parturition. Plasma noradrenaline was insignificant from controls at parturition but an increase was observed 4 h post partum. The determination of adrenaline stores of adrenals during pregnancy showed marked decrease at 30 days. This decrease continued up to 31 days. At parturition the adrenal adrenaline was higher than at 31 days. The ratios adrenaline to adrenaline + noradrenaline show increased sympathetic activity during the last part of pregnancy. The results suggest that variations in hormonal concentrations during the last part of pregnancy induce higher activation of the sympathetic nervous system which results in higher release of adrenaline and noradrenaline from the adrenals.

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